Pluto is one of the most mysterious and controversial celestial objects in the solar system. Find out what most mystifies scientists and stargazers about this dwarf planet.

Newton presents his findings on gravity to a group of scientists. Among the attendees are Sir Robert Hooke. During his explanation of the inverse-square law, Newton notices that Hooke appears to be stealing his work, so he abruptly ends his presentation.

Sister learns more about stars and teaches the rest of the family about it on a starry night.

Exoplanets challenge the notion that we are alone in the universe. Learn what types of exoplanets exist, the methods scientists employ to find them, and how many worlds might exist in the Milky Way Galaxy.

Huckle wonders about life on the moon. They learn about all the different characteristics of what makes the moon unique.